Compare compilers and interpreters
Choose a translator for development or final delivery by weighing feedback, executable creation and run-time needs.
This sequence follows Cambridge IGCSE Computer Science 0478, 2026–2028 syllabus Version 6. It covers subject content sections 4.1–4.2 only. The separately published 2029–2031 syllabus is not mapped here. Practice is original, self-checked and does not award an official Cambridge grade. Full timed papers and human subject-teacher review remain outstanding.
Before you begin
- No programming language is required. Be comfortable with place value and multiplication; each lesson introduces the computer-science notation it uses.
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
Which translator creates an executable after translating the whole source program?
What you will learn
- Compare compiler and interpreter workflows
- Explain why interpreters are often used in development
- Explain why a compiler may be used for a final program
The translators support different stages
An interpreter translates and executes line by line, giving immediate feedback during development and stopping when it reaches an error. A compiler translates the whole program and reports detected errors before creating an executable.
Apply and check the rule
An interpreter is often useful while a programmer is developing a program; a compiler is often used to translate the final program for delivery. A compiler can produce an executable that runs without translating each source line at run time, while an interpreter must be available to run interpreted source.
Pause and explain
Why might a compiler suit final delivery?
Worked example
A developer wants quick feedback after each code change, then plans to distribute the finished program. Which translators may suit each stage?
Show the worked solution
- During development, an interpreter can run changed code line by line.
- For final delivery, a compiler can create an executable.
- Both workflows still need testing.
Answer Use an interpreter during development for quick checks, then compile the final program into an executable for distribution.
Try a topic test
Choose Easy, Normal or Difficult. Save your answers and open worked review after finishing.
Test this topic →From guided practice to a new situation
Write your answer and reasoning first. Use a hint only if you are stuck. The model solution is for self-checking; your written work is not automatically marked.
Give one compiler advantage and one interpreter advantage.
Give me a hint
Compare delivery with development feedback.
Compare my reasoning
- A compiler can produce an executable after whole-program translation.
- An interpreter provides line-by-line feedback during development.
A compiler produces an executable; an interpreter can give immediate development feedback.
Look for these in your work
- Compiler feature
- Interpreter feature
A teacher is demonstrating one-line code changes to beginners. Which translation approach can make feedback easier?
Give me a hint
Consider how soon the changed line runs.
Compare my reasoning
- An interpreter processes and executes a line at a time.
- A reported error can be addressed near where it occurs.
- This can make short development experiments easier.
An interpreter is useful because it runs code line by line and reports an encountered error during the demonstration.
Look for these in your work
- Approach selected
- Feedback linked
- Use case
A team says its compiled program no longer needs any other software or compatible hardware. Explain why this overstates what compilation guarantees.
Give me a hint
Compilation creates machine code, but execution still has dependencies.
Compare my reasoning
- Compilation produces an executable from translated source.
- The target still needs a compatible processor architecture and operating environment.
- Compilation does not prove logical correctness or remove all runtime dependencies.
An executable still depends on compatible hardware and system support, and it may contain logic errors. Compilation translates code; it does not make it universal or guarantee correctness.
Look for these in your work
- Executable defined
- Compatibility condition
- Correctness limitation
Common mistakes
- Claiming one translator is universally better
- Forgetting that compiled programs still need compatible hardware or system support
What can you explain now?
Which translator is commonly useful during development for immediate line-by-line feedback?
Compare with the explanation
Interpreter
An interpreter executes translated lines and stops near a run-time error.
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Make it stick
Which translator is commonly used for iterative development, and which for the final executable?
If you needed the solution, close it and solve the problem again from a blank page. A correct answer is stronger when you can explain the reason for each step.